Use of phosphogypsum as a soluble calcium source for increasing urea efficiency in a calcarious soil

ammonia ammoniac analyse chimique analyse statistique azote calcareous soils calcio calcium chemical analysis composition crecimiento croissance crop yield fertilizantes fosfatados fertilizers fluor fluorine grain granos growth muestreo nitrogen nitrogen content paja de trigo phosphate fertilizers rendement des cultures rendimiento de cultivos residues residuos saison sampling seasons soil chemicophysical properties sol calcaire statistical analysis teneur en azote triticum aestivum urea uree wheat straw